How to make a realistic Pepsi material?
What I landed on was similar to boots, but using a Clearcoat.

I couldn't shade smooth here, I'm assuming you can at some later point in the process.
As far as the fluid sim portion, to me the main thing to aim for is pronounced and persistent bubbles.  I don't know if that can be fully achieved with these controls:

I think in the longer term an emitter/rigidbody system of some sort would be necessary to maintain the appearance.
All I can say is good luck, because baking these sims to test behavior is very time consuming.